StelToast.hpp

/*
 * Stellarium
 * Copyright (C) 2010 Guillaume Chereau
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef _STELTOAST_HPP_
#define _STELTOAST_HPP_

#include <QCache>
#include <QObject>
#include <QString>
#include <QTimeLine>
#include <QVector>

#include "StelSphereGeometry.hpp"
#include "StelTexture.hpp"
#include "StelTextureTypes.hpp"
#include "VecMath.hpp"
#include "StelToastGrid.hpp"

class StelPainter;
class ToastSurvey;

class ToastTile
{
public:
    struct Coord
    {
        int level;
        int x;
        int y;

        bool operator==(const Coord& b) const
        {
            return level == b.level && x == b.x && y == b.y;
        }
        bool operator!=(const Coord& b) const
        {
            return !(*this == b);
        }
    };

    ToastTile(ToastSurvey *survey, int level, int x, int y);
    virtual ~ToastTile();
    Coord getCoord() const { Coord c = { level, x, y }; return c; }
    void draw(StelPainter* painter, const SphericalCap& viewportShape, int maxVisibleLevel);
    bool isTransparent();

protected:
    void drawTile(StelPainter* painter);
    const ToastSurvey* getSurvey() const;
    const ToastGrid* getGrid() const;
    bool isVisible(const SphericalCap& viewportShape, int maxVisibleLevel) const;
    bool isCovered(const SphericalCap& viewportShape) const;
    void prepareDraw();

private:
    ToastSurvey* survey;
    int level;
    int x;
    int y;
    QString imagePath;
    bool empty;
    bool prepared;
    bool readyDraw;
    StelTextureSP texture;
    SphericalCap boundingCap;

    QList<ToastTile*> subTiles;

    // QList<SphericalRegionP> skyConvexPolygons;
    QVector<Vec3d> vertexArray;
    QVector<Vec2f> textureArray;
    QVector<unsigned short> indexArray;

    // Used for smooth fade in
    QTimeLine texFader;
};

inline uint qHash(const ToastTile::Coord& key, uint seed = 0)
{
    //with a maximum level of 11, the x/y coords may be up to 4^11
    return qHash(key.level << 28 |
             key.x << 14 |
             key.y,
             seed);
}


class ToastSurvey : public QObject
{
    Q_OBJECT

public:
    ToastSurvey(const QString& path, int maxLevel);
    virtual ~ToastSurvey();
    QString getTilePath(int level, int x, int y) const;
    void draw(StelPainter* sPainter);
    const ToastGrid* getGrid() const {return &grid;}
    int getMaxLevel() const {return maxLevel;}
    int getTilesSize() const {return 256;}

    ToastTile* getCachedTile(int level, int x, int y);
    void putIntoCache(ToastTile* tile);

private:
    ToastGrid grid;
    QString path;
    ToastTile* rootTile;
    int maxLevel;

    typedef QCache<ToastTile::Coord, ToastTile> ToastCache;
    ToastCache toastCache;
};

#endif // _STELTOAST_HPP_